mkl_?csrgemv

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 6/24/2024

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mkl_?csrgemv

Computes matrix - vector product of a sparse general matrix stored in the CSR format (3-array variation) with one-based indexing (deprecated).

Syntax

call mkl_scsrgemv(transa, m, a, ia, ja, x, y)

call mkl_dcsrgemv(transa, m, a, ia, ja, x, y)

call mkl_ccsrgemv(transa, m, a, ia, ja, x, y)

call mkl_zcsrgemv(transa, m, a, ia, ja, x, y)

Include Files

mkl.fi

Description

This routine is deprecated. Use mkl_sparse_?_mvfrom the Intel® oneAPI Math Kernel Library (oneMKL) Inspector-executor Sparse BLAS interface instead.

The mkl_?csrgemv routine performs a matrix-vector operation defined as

y := A*x

y := A^T*x,

where:

x and y are vectors,

A is an m-by-m sparse square matrix in the CSR format (3-array variation), A^T is the transpose of A.

NOTE:

This routine supports only one-based indexing of the input arrays.

Input Parameters

Parameter descriptions are common for all implemented interfaces with the exception of data types that refer here to the FORTRAN 77 standard types. Data types specific to the different interfaces are described in the section "Interfaces" below.

transa

CHARACTER*1. Specifies the operation.

If transa = 'N' or 'n', then as y := A*x

If transa = 'T' or 't' or 'C' or 'c', then y := A^T*x,

m

INTEGER. Number of rows of the matrix A.

a

REAL for mkl_scsrgemv.

DOUBLE PRECISION for mkl_dcsrgemv.

COMPLEX for mkl_ccsrgemv.

DOUBLE COMPLEX for mkl_zcsrgemv.

Array containing non-zero elements of the matrix A. Its length is equal to the number of non-zero elements in the matrix A. Refer to values array description in Sparse Matrix Storage Formats for more details.

ia

INTEGER. Array of length m + 1, containing indices of elements in the array a, such that ia(i) is the index in the array a of the first non-zero element from the row i. The value of the last element ia(m + 1) is equal to the number of non-zeros plus one. Refer to rowIndex array description in Sparse Matrix Storage Formats for more details.

ja

INTEGER. Array containing the column indices for each non-zero element of the matrix A.

Its length is equal to the length of the array a. Refer to columns array description in Sparse Matrix Storage Formats for more details.

x

REAL for mkl_scsrgemv.

DOUBLE PRECISION for mkl_dcsrgemv.

COMPLEX for mkl_ccsrgemv.

DOUBLE COMPLEX for mkl_zcsrgemv.

Array, size is m.

On entry, the array x must contain the vector x.

Output Parameters

y

REAL for mkl_scsrgemv.

DOUBLE PRECISION for mkl_dcsrgemv.

COMPLEX for mkl_ccsrgemv.

DOUBLE COMPLEX for mkl_zcsrgemv.

Array, size at least m.

On exit, the array y must contain the vector y.

Interfaces

FORTRAN 77:

SUBROUTINE mkl_scsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m

   INTEGER      ia(*), ja(*)

   REAL       a(*), x(*), y(*)

SUBROUTINE mkl_dcsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m

   INTEGER      ia(*), ja(*)

   DOUBLE PRECISION       a(*), x(*), y(*)

SUBROUTINE mkl_ccsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER      m

   INTEGER      ia(*), ja(*)

   COMPLEX       a(*), x(*), y(*)

SUBROUTINE mkl_zcsrgemv(transa, m, a, ia, ja, x, y)

   CHARACTER*1  transa

   INTEGER           m

   INTEGER           ia(*), ja(*)

   DOUBLE COMPLEX    a(*), x(*), y(*)

Parent topic: Sparse BLAS Level 2 and Level 3 Routines.

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

mkl_?csrgemv

Syntax

Include Files

Description

Input Parameters

Output Parameters

Interfaces

FORTRAN 77: